`analyze` does not detect translation key usage when keys are accessed via intermediate variables

Describe the bug When running the analyze --full command, the tool fails to recognize translation key usage if keys are accessed through intermediate variables.

To Reproduce

1. Access a translation key with chained access (works fine):

   context.t.section.subsection.key
   

2. Assign intermediate variables:

   final tSection = context.t.section;
   final tSub = tSection.subsection;
   

   Then use:

   tSub.key
   

3. The analyze --full command incorrectly marks the key as unused.

Expected behavior Keys accessed via intermediate variables are not detected and are incorrectly flagged as unused.